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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4c025125409e20633c9a3f0e428cb8d3096d1d858c5f73f616c0d9d9e24426c' 
  AND token = 'LtzqxCiFYZ5uS6mq0JoDL9qexSNnOHcEKnvnEsRTIlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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