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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab8eb1a249a6ed7ebda989b9593f47bf1d170ebe61e74eaae34e525626c749d5' 
  AND token = 'FiX99z5p40TKqAXHosaG1b8cz2t+RdMt+ulNZDdNBqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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