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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d657bfc18b42605b4a37e5351325f38225d8459b53f0920d2ec7b68c4b5fffb' 
  AND token = 'COPqa8rwHvDB8IBED5vZjKM6ki45Swy32HP1Znxl4Nw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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