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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54f43d63fabbeab15b90213f8f6befc6c1e1161033957d8906ea61a80977cb72' 
  AND token = 'fdnMnUQOcE9D7YUqZdUJpnM3CaeYy1+74ldUgs3faXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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