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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d70466ec1996fda8c193e44a461329c0ffc97879449dfd32ed8f88b88b23284' 
  AND token = '0SaNFrLfulnCzEnUtQg2noV8VSWFYP84sDSRLuF+yhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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