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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '048cc8efba3f378e40fb6c7a23442419d6986cc3b0f5711e648ace00fa0a1efb' 
  AND token = 'Qppnmj2XYeDqSKtr/W/XtjIzMxU1Sb39gvK+cL0OFpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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