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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9c9370986702376a6ec3bed03e8cbb6de7f40fe0e442c23876e91f5d99e0f7b' 
  AND token = 'MU8MbI2SAv7TekStYlLC+Y6kJiy9S/aVHQKuLhDYW4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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