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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b69859f68447863ee6c257cc53f09a7b8375868765b450c0a5cae49eb62636f' 
  AND token = 'xfD61Ja/qTNxF7+479BNBQarM2J+eR9/u0xjuxMWKN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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