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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9a3d7613d10d6b95f48e278b19e6580efd8a3ccab7f6c0160aa4b396508bdd9' 
  AND token = '54+xmDJcC7MEEsAhXghUQHTfJ5XhkvpvLXp0ZN9pHWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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