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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5ed11eb4e1f87e3dcdedb71411183ba43c35fc65ddb74354aed53eae94dfc89' 
  AND token = 'tNjlAurznU1Vxg8OUG7f9oMtRnWV8dhPTGkCdjzcmaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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