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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72d584458a00c6c19ac8fa8799af3dbd1dc7f71e653df8951c1686d60e8b8142' 
  AND token = 'tLiXi0Yivp0GhYAeMoZuDiydT0Scykp2uQhiceWbp+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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