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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '035a7763ec9d85db34a20a9549b84115a8916f0a1a737df802c76bfe09d058ef' 
  AND token = 'xyofg1vwNIZA0YDtPwjkUY+Q9JzQ6Ite5/Atqmeit5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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