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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c61428ba0195b46017774e042875400e0d7df0af9d4df7879f65e047b4f7005' 
  AND token = 'U9tgMCQaFcUadP8owusmIXdtPY3Pn8F11JbOwOmQez8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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