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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '836f0b960a5c08c6202dccaae16424a5e7cbe76f2b5c0af96cdb382d9108043c' 
  AND token = 'PlJjkTSzX1msKf+epIpvx8xuqEnBT0qS9fhvs6PUBug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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