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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7ae27a8bb706e27cc45736f7e23ebc17fd8ef37c1f7efdab788d103291f23a6' 
  AND token = 'BXJ9OF89AfJEzBLpiiFWdH3jCIvF9vCvMwYtr7J62ys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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