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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '360645939e0a424ca6774882c8b02328dcb216030a89af1939c4c7e7ce6de1f5' 
  AND token = 'IABFJbj5kegQ425AZtTI22Qn/6FbgyvfhoVyVJqb7Lg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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