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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a513f1e052d2d7bbb9a1077608220136e1180c65a05197ffb2d2857d886c10f' 
  AND token = '1xtZ93ab+Mp3e5lbdOneaWuRQMg2TYcCVZ3rLdaB62w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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