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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '313dff1fd4b68b82142c6ba7b7c82da59beb4cb5afe286f5acdd5c463ac8c3da' 
  AND token = 'aot5CL2NdG3098DrSl/lzXHO9rcSrgFx0opCTIM3H4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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