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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d5e17a87f7220f3e2f195f2598cb93119e681bbca46612e920e8a88ae05e822' 
  AND token = 'ujbssP733dpfZoBnuJx8mdNvnRtA2+qw3GupKMrtr14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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