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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b59abf8700450d57f3f0b80abaf3b06d62244020e3bfd9f394345d7d4894905' 
  AND token = 'oFrRtZq2iNtjOjXhLo85OYEYyUNhXVxSze5+u84+ui4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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