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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d18ac1691e477e14841165f394e0589f82741c978fd6de0d497b2ec22cf21b7' 
  AND token = '2fz9tpqrDi3ZE2Ji2ichsxf5MazsQD1Ijuq8EwZH65A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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