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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac3a3d8030df82cc0e4bf06b1815a85b18de97b1c7a84fbc5cc065b059ce8e3f' 
  AND token = 'I84XcIVzI0MPSOmrAF3CqRMs9A4L3+g3ZQKPSoAuF9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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