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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9fc58880710138e3368f36b6a67f7f6e8b9aed5bdeb86f136420ee74eb07dea' 
  AND token = 'm+8JD1YUuayiQ5Yvu/LiVQKg6g/ckRMkjgXMnX+C65U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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