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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af49b6fb4fb714c42763d092a2b77a40477eb70200773ffd8e6d74d06811495b' 
  AND token = 'Rx3vqymn1ljUeQpr1eiZfZpCFJV+z8zw8LYrY3O+fds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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