SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06f7eba23ea453e473326fa2b8a91ea85f4216909dc1cb3a9cb05af2d15c7038' 
  AND token = 'k+nSy4/gh+Gjs53ZzqK2D10ToRgOwDaFQdgQFYLYTGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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