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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70b9e68c17d6ea4a0de6980e4feda52f83d969aad9d17ec1b17566a1350e74a7' 
  AND token = '3YmLefkcfaYXyGRvyc+9443wot88aAK/Zqv5LzZYK5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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