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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afc6e09517d8cdffb7d84e09b214cf26cdce5b173fd55fecb19640beb76fa6a9' 
  AND token = '9+S0T6DOgJMQzuJ2gcih8W6IXn9rmFf+jOlloaP7Rag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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