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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86dff6e840a13dd4e1cc908d3d7bd1ecea35ac9dc260c6e58541e8b6387340ef' 
  AND token = '2mIJi54BB0x4FO3erLGBeNghKllc77wZFA2J9ZuSstU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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