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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7b6ccba63fec2a78236f07abc88ffd46925a1ee9f5c7f53ff704827ace6ab70' 
  AND token = 'cy3FRG7XU3XkJbgEkxDWjY10A7awctUf5j8cSBJcBRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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