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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9830ccaeb628dafef5c396e7d5ecb97ce09ba190789a56515496f9c3a46696e9' 
  AND token = 'AdgIN7PbhKXdps3ANRKKZYSIwOB7YYCQvi5NzdBht20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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