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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23450471d6acf4ac3a878259756f36b6ca42781544b1b4913263804258911307' 
  AND token = 'Sf9dHlObP/6ANND/0gsl6PmZUCfIVJOQfh/2rYA0PaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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