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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a3efb83f9d19efa794c7f051ef421d6d279dff51e4e634671e67c6f67f7ec90' 
  AND token = 'XxsdM26SsJngHVyrmzd4j6Lwam+UkXBH5AfP9prWQeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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