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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0f1900013a1564528fb92b39af7b0d00b86648c65b18d2db25d229a58d2664b' 
  AND token = 'eDRcTyT0H6cQc5QrlwbTqsHXbqVOBYi9+5C5KzwT9fg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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