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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9912551afbb72d068458f80417a73307aa4529ce5e237256f42f6f558eca2115' 
  AND token = 'ATi3TZjJM4kAl5myfjaAsbwnt0o2a4c41ZYT8GtJIwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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