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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a10d9275cd2398b8e3c2de6ff90d4ea38887beef7a49307ee973ed403f3e59f3' 
  AND token = 'I92EhuDH/H6bgrc6DGcjhcwsSEb3Ac8Bu6w/jAKXAmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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