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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92b50d7bc20a2b93b10932e6e7f131ec124231690bfb5f178cfe1a43a7f3c87e' 
  AND token = 'tuYFbmEOBFBzym4Ec6sVZ18dOHwppYksyfzZt/tfl3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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