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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1337d346c066bedc9c08c0f8316943572b2693819432d4f7084157dba64a9b29' 
  AND token = 'VWOE4qTFPIrs8wNvjqckzA4Bjr6t7tAUhN2bAfnH6Cw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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