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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '365838bd6c05bfe5e2ba8b64a349715b7a9606829d2ca358f2b66ec16bed3df6' 
  AND token = 'A6w7m86TYJ0HsihzW50Cdczs4z958W774OAIFC+xrAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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