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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2921c3957eaa8d909d86c49edd9a3939c5c973dcce255983edf5406e274b9e2' 
  AND token = 'A9FBSpd8wwa2RvL9JaUWLTK3Z03VaiP/LaFpCy+zIUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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