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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db28b3332b4dae45d45faf82832bcb8d2d4dd6a1f2000b483c9a0938d7733573' 
  AND token = 'ff3lHxoxsX4rZWJfMKxBNEJEz05YCtfeiYMgRI1ZUlo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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