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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '234ac1d03b9a776189859c41eb315894c08749a57ff5d7cad8ff4ed5e387bcb5' 
  AND token = 'b7tEY03V5VgAnL+Hr9Ab12ZiiIHpNmcIiC6XUZFLOhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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