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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '201bd749fd3c030e93fdffe2b65c147c33fcd77474a1bfbda7b0199bf1d50753' 
  AND token = 'i2RU8CIV3G3OUtTJ3Ob53vsWy/gzONakMkVw+giLYQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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