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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '302088f07396d60c6fafa266da690aa3192f10ac93cbf281baddc011fbd0346a' 
  AND token = 'boaknd9eGD0yI5RzxXuMj5U9FNPGB47lVTsmxXqsl8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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