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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b17e6d3e210e80a5652698de1ae77dbcd6f0828538b6a18f0c942a85e88ba85' 
  AND token = 'gTbdcg2CInkFZmOsf3DnSVfY74V3z94fIqJo53ZMc08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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