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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9447a369d3ef962c08e8b28e8e5e832120f965bdea56700055ce113e68e2438c' 
  AND token = 'DEqdwf1jyWymRHIZWsT6uFbQm6cS28PVg7Th+SFQ6fI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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