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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '343aa2a7e1dbabf05f21cc0f316edae8c76d98bd3eaa00f07db8f3a18a28c01f' 
  AND token = 'Os63F4KzZ1/3bIwvUHsx8jVhCltmkz8NP0RDvD1/KA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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