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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba78fa09481192d57d9955d84baa3e7090513673c6444c4650e7427d22279e8c' 
  AND token = '8Zxe1mfr+qINeHz/Bg4TFEXRzilY+IHG9hW6r8N7jIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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