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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fedb2c1dc49f71037dc8cf18e8ab86f69da70ad48d8cb1c144a6314906e412e' 
  AND token = 'Ewan/Sjw1wZSRJEPx4AR68gaz7P6aGd26Te2QH1s2vk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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