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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb32fada68df127eb3b4d9e519f6b5efcd5f518a7d0d44cd628942e7c4dca477' 
  AND token = '2Z8OhMR3QK1QXIN6D3T6aCQkKDzHlyxUwD7z0p8nSiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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