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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1471d5e86f0b17d8e9826dcae5acc2d95e2fed6a65d85f46faceee691fb5fe00' 
  AND token = 'LrD1EwlI7Q0AKIJEnc8HuikB8MmL+8e9GUxQV/tTl8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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