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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '745654acdc07f1ac6aaeee9402066099e6835c440ba3d4466aead5fb6f53ecab' 
  AND token = 'v61i+4fa+HF1PtE/D8iyPjY0H3kY/fFfa8Hp3vM9lAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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