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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd83e990ff578c1bab6b150ebe5b0e8b728c1f1735e168ca11d9fd6c2b67aedef' 
  AND token = '/zsJLDlGz33D6saiHbf2+MJp00m44F8oIckWsZyFqCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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