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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b7cabc668034371b06a1682670bbe9d3f0f8c4ff3fa101df99a18a9331329a2' 
  AND token = 'vvb9dBofkSlBy91h1osJ3XrsHdvXpvmtF0IByBG4WsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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