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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8604ca978de79e9b4faa26a7a147449412aef0dccc1c354fbc77444d0716b5a' 
  AND token = '0jPnMBOriQbI7CRG75DX5fyRr8dNyRwKMBQm8XM/joY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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