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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd92419f74f97a2fad1ed8474c066fa3488bfe41cc5c9ff46a32648bdcdbc008e' 
  AND token = 'nBRI2jVKiZh9RdykwE5eP8Ea4huImhGA7QE/mv9dUCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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