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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a3ea30e6a83b33e6609c38129d509d0db41d7a1ab2b599ef205f943a9b68ba3' 
  AND token = 'skJsU+9xINIBdNAw5GoALzt1dzDkJj2gV0lvI/+t/j8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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