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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4ef61fcd20fbcd37d6039903b279fd9e408f244fb05cea3172d3a3f871a2921' 
  AND token = 'G5LadoG7JbHNXHECwySlgS3cH+JF62/n47nvG2APTW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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