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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8487e8ec0431180a50165407c8e193ed31c9771cafd29941dd331c1fdc1bac34' 
  AND token = 'xZi+Wls67qNGZ32srjd6iIrlJkCqxoWY00gHIIxxwoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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