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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcd6a05299c0b18067760b51c29f36c44b8eaef02f1fc6c4ca4d3a5c3a5fbbe2' 
  AND token = 'Kqh21XKMmAFNuBX/og6cMb/78+YL79FxQ9uOktsKiks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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