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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bec7291d73fad3e3b9cd1b16fbd146a3d2e6e98ba231629c06a53a6adc7c458' 
  AND token = 'cQbm5aHr/hH+H6+ciJP4aLYtRnfHcmda7/R6F7lYzEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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