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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c5f6396c2a762166e05026c3bda3de5c4f4d391ff60805b5ec1f5e237853363' 
  AND token = 't7atkj8qc8zNlkksw3qVTUcte/vhRaA5wGRXADWyfU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}