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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '717b8667809d2e75d6aab7d9edb5dd5bdd25c072b2a777e36555a2a11f718e56' 
  AND token = '/CZlxu1sbL78dMsBfWgujuzfhSLYos+61Hhj6R2RqkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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