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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97bc952ef63fda134e60499e2309eb30b73cb4a7da65e92f82ca855dc4ba1e68' 
  AND token = 'kOs8xbp9HK6K28bG7zRZOqsRorKxwJnoTpEbV9ViJjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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