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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae799d5d9c09dfee5d9e77fdfa72cb5ece92068839f171a9d608d0f54fb2da92' 
  AND token = 'GFJqx+kQJsGvfhMDw6rUOZZZTDHqoda4ra9+a7sV3Gc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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